CE Quiz 36

Normally prestressing wires are arranged in the

A simply supported concrete beam is prestressed with a force of 1500kN. The beam is designed based on load balancing concept for an effective span of 10m and to carry a total load of 30kN/m. The central dip of the cable profile is:

Coefficient of shrinkage of high-grade concrete for post tensioned work is

Prestressing losses in post tensioned and pre tensioned beams are respectively

An ordinary mild steel bar with Young’s modulus 200 GPa is prestressed to working stress of 200 MPa. The effective stress left in steel is ________  if the permanent negative strain due to shrinkage and creep is 0.0008.

Find the maximum compressive stress in the concrete of a rectangular beam (100mm x 200mm) prestressed with a force of 200kN at an eccentricity of 50mm.

Loss of prestress due to anchorage slip occurs:

A post tensioned concrete beam of size 150 mm x 300 mm is prestressed by three cables each with a cross sectional area of 40 mm². An initial stress of 1300 MPa is applied. The loss of stress due to elastic shortening in the beam when simultaneous tensioning and anchoring of all three cables are done will be:

Ideal final stress distribution at transfer in prestressing is given below, i.e.